My 12 Interval Studies for Piano are for ear training, finger training, and voice training. Anyone who can play the piano moderately well can play them and benefit from them. Not just an exercise, these are short compositions which feature one interval at a time. Practicing each hand alone will help one hear and feel the intervals.
Recently I went through all the scores and edited them to make them easier to read and play. The audio of each one is now available on MusicaNeo. All of them now have videos on YouTube. Check them out! Type my name into YouTube to see all of my videos.